While this book is just a survey, I found it very amusing--but, then again, the compilations of Celtic legend that I've come across here have been scanty at best.Seeing something that goes beyond "The Children of Lir" and one or two common Cuchullain stories for the Irish section is good in my book. However, Ellis did not stop there. I've poked my nose into a few books about Celtic mythology, and I've never heard of the vast majority of these stories (and they were delightful, if I might say!).
That being said, seeing names and terms in the original language was actually rather delightful (though I'm horrid at Welsh and probably butchered all of those names as I read!); what I'm trying to say here is that, for me, it lends something to the story when you say 'Fionn MacCumhaill' rather than 'Finn McCool.' Or, perhaps, it wasn't even that! Considering Ellis is also the author of the Sister Fidelma mysteries, he has quite the authorial voice--and this shows itself in his retellings of these myths (much to thee reader's enjoyment, I might add). Not are most of the chosen stories entertaining, you can almost hear a little storyteller in your head.
While this is just a survey of Celtic folklore in general, it's definitely something for both those relatively acquainted with the topic and for those who have only ever heard of King Arthur.